[Twisted-Python] mutex in twisted?

Gabriel Rossetti mailing_lists at evotex.ch
Tue Mar 11 07:31:46 EDT 2008

Gabriel Rossetti wrote:
> Hello,
> Is there some sort of mutex/semaphore code that can be used in 
> twisted? I need to run an external subprocess from twisted when I get 
> some data from a client and I'd like to make sure that while one 
> client's data spawned the process to run, some other client will not 
> do the same at the same time, thus my need for a mutex. Maybe there is 
> another way to do this in a more twisted sort of way (pun not 
> intended)? If so I'd love to hear how!
> Thanks,
> Gabriel
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Oh, I forgot to say, I use this for the process :

subprocess.call(["festival", "--tts", filename])

I'm not sure if it is useful for anyone, but I just saw that Twisted has 
some sort of process code too, though it looks a bit complicated for my 


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